Simplenote is a free app for iOS that belongs to the category Productivity, and has been developed by Codality, Inc.. It's recommended for students, college students, small business, teachers, business owners.
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People say did i mention it allows real time collaborative editing, it keeps all my lists handy for shopping at different stores, works incredibly fast and efficiently by syncing notes between devices instantly.
If you like Simplenote you'll also enjoy: GoodNotes - Notes & PDF, NoteMaster - Amazing notes synced with Dropbox or Google Drive, Springpad, Evernote, Awesome Note (To-do/Calendar/Reminder/Memo), Notability.